This morning I noticed both eyeholes that hold the chains that hold us to the dock were ripped open, bent and twisted by the forces of the river. (the ropes holding us were in place)
I spent an hour replacing the eyes and lengthening the chain and rechaining.
The naval engineer neighbor happened to be on the dock when I was inspecting the damage and said that this river shifts and moves as if everything on it is going through a 4.0 earthquake.